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0.5ct Spinel (Round, 4.91×4.91mm, Red) vs 0.3ct Sapphire (Round, 4×4mm, Purple)


Quick summary: When looked from above (face-up position), 0.5ct Spinel (4.91×4.91mm, round cut) appears 51% larger than 0.3ct Sapphire (4×4mm, round cut). See below how they compare side-by-side on a ring and finger.

0.5ct Spinel (round cut)
vs
 0.3ct Sapphire (round cut)
red
 
purple
4.91×4.91 mm 4×4 mm
actual size
Actual size of 0.5ct Spinel (round cut, 4.91×4.91mm, Red color)   Actual size of 0.3ct Sapphire (round cut, 4×4mm, Purple color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Red 0.5ct Spinel (round cut, 4.91×4.91mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Purple 0.3ct Sapphire (round cut, 4×4mm) on a right ring and finger
Your settings
Ring
 Gold
Skin tone
 Light
Ring diameter
 16.9 mm
Ring width
 3.0 mm
Finger length
 64 mm
Finger coverage
 30% vs 24%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.5ct Spinel Round (4.91×4.91mm, Red) and 0.3ct Sapphire Round (4×4mm, Purple) as they would appear on a ring and finger. Adjust the ring and finger size to get an idea of how these gemstones would look on your finger.

Where to buy?

For certified gemstones, high-end gemstone jewelry, and birthstone jewelry, see Blue Nile

Face-up Size

All things being equal, Sapphire will face-up smaller than Spinel for a given carat weight, because it has higher specific gravity (4 vs. 3.6 - this means it's "heavier" compared to Spinel of the same size). Face-up size also depends heavily on the proportions of the cut.

Face-up area is a measure of the size of the gem when viewed from above (as set in a ring). It tells you how big the gem is at the girdle plane.


0.5 Ct Spinel (Round) 0.3 Ct Sapphire (Round)
4.91×4.91 mm vs 4×4 mm
18.93 mm²   12.57 mm²
Face-up size outline for 0.5ct Spinel (4.91×4.91mm, round cut)
Face-up size outline for 0.3ct Sapphire (4×4mm, round cut)
0.5ct Spinel Round (4.91×4.91mm)
0.3ct Sapphire Round (4×4mm)
Difference: 51% (6.36 mm²)
0.5ct Spinel (Round, 4.91×4.91mm) has approx. 51% more face-up area than 0.3ct Sapphire (Round, 4×4mm).


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